When did major changes begin in the U.S. comic industry?A.Before the start of World War Ⅱ.
When did major changes begin in the U.S. comic industry?
A.Before the start of World War Ⅱ.
B.After the end of World War Ⅱ.
C.During World War Ⅱ.
D.Several years after World War Ⅱ.